Phone calculators, especially touch screen smart phone calculators, need to come with memory. It so easy and baffles me why they still don't.
So that's why I made Ticker Tape Calculator. It's a simple calculator that does most of the functions of the Android calculator, including a scientific panel, plus it has memory buttons. But it also remembers all your calculations on a "ticker tape", just like accountant's calculators spit everything out on paper. Even email the ticker tape to yourself.
This is provided on the Android Market for free as Free Ticker Tape Calculator. If you'd like to support my further android development, a paid version is also included, named Ticker Tape Calculator. There is no functional difference between the two.
If you're up to it, let me know how you like it and any feature requests you have!